Al-An'am 6:123

وَكَذَٰلِكَ جَعَلْنَا فِى كُلِّ قَرْيَةٍ أَكَـٰبِرَ مُجْرِمِيهَا لِيَمْكُرُوا۟ فِيهَا ۖ وَمَا يَمْكُرُونَ إِلَّا بِأَنفُسِهِمْ وَمَا يَشْعُرُونَ

Wakadhālika jaʿalnā fī kulli qaryatin akābira muj'rimīhā liyamkurū fīhā wamā yamkurūna illā bi-anfusihim wamā yashʿurūna

And thus We have placed within every city the greatest of its criminals to conspire therein. But they conspire not except against themselves, and they perceive [it] not.